Typewriter



Aug. 13, 1929. I. c. D. YOUNGBERG TYPEWRITER Filed Nov. 28, 1924 4 Sheets-Sheet Aug.- 13, 1929. c. D. YOUNGBERG 1,724,163

TYPEWRITER Filed Nov. 28, 1924 4 Sheets-Sheet 2 g- 13, 1929; D.YYOUNGBERG 1,724,163

TYPEWRITER Filed Nov. 28, 1924 4 Sheets-Sheet 5 1929- c. D. YOUNGBERG 1,724,163

TYPEWRITER Filed Nov. 28, 1924 4 Sheets-Sheet 4 Patented Aug. 13, 1929.

UNITED STATES PATENT OFFICE.

CONRAD D. YOUNGBERG, OF WOODSTOCK, ILLINOIS, ASSIGNOR TO WOODSTOCK TYPE- WRITER COMPANY, OF WOODSTOCK, ILLINOIS, A CORPORATION OF ILLINOIS.

TYPEWRITER.

Application filed November 28, 1924. Serial No. 752,506.

This invention relates to typewriters, and

= appended claims.

In the drawings i Fig. 1 is a side elevation, with parts in section, showing a power driven typewriter embodying one form of the present invention;

Fig. 2 is a rear view of the mechanism shown in Fig. 1, with parts in section;

Fig. 3 is an elevation, with parts in section, showing a modified form of the invent-lon Fig. 4 is a section on line 44 of Fig. 3;

and

Fig. 5 is a section on line 5-5 of Fig. 3.

Referring first to Figs. 1 and 2, the nu-' meral designates the frame of a typewriting machine upon which a carriage 11 is mounted to slide transversely and is actuated by any movable escapement mechanism, such as that commonly employed in connection with the. Woodstock typewriting machine. A plurality of type carriers 12 are slidably mounted in radially directed slots 13 in position to engage the front face of the platen on the carriage 11. The type carriers 12 are actuated by toggle links 14 which are in turn operated by levers 15 pivoted at 16 on a bar 17 extending transversely of the typewriter frame. The levers 15 are moved by arms 18 pivoted at 19 on a bar 20 extending transversely of the type- Writing machine. The arms 18 carry actuators' 21 which have teeth 22 thereon inposition to engage a rotary cylinder 23. The actuators 21 are selectively moved into engagement with the cylinder 23 by the key levers 24 in a manner more fully explained in application of Otto A. Hokanson, Serial No. 732,615, filed August 18, 1924. .The cylinder 23 is driven by worm gearing enclosed in a. housing 25 and actuated by a shaft 26. The shaft 26 is in turn operated by a gearing enclosed in a housing 27 and connected with a motor 28 positioned within the frame 10 beneath the platen carriage 11;

In order to confine any noise which may be produced by the motor 28 and the operating parts of the typewriting mechanism to the interior of the typewriter frame, the interior-of the frame 10 is made into a substantially closed chamber with sound dead.- ening walls 29 completely enclosing the operating'parts, except for such places as it is necessary for the moving elements to project through the casing. The front end of the casing, for instance, is provided with slots to accommodate the key levers 24 and the top of the casing is'provided with slots to accommodate the toggle links 14. The walls of the casing are also provided with the necessary openings for the operating parts connecting the actuating mechanism with the platen carriage 11. The walls 29 may be made of any suitable sound deadening construction and I have shown by way of illustration a triple wall consisting of an outer sheetmetal cover 30, a middle plate 31 of lead, and an inner layer 32 of felt. WVhile I have found these materials to be very efficient in confining the sound to the interior of the typewriter, it will be understood that other Wall construction and material may be employed for this purpose without departing from the spirit and scope of the present invention.

As shown in Fig. 2, the housing is provided with openings at the sides thereof in which mufliers and 34 are installed. These mufflers comprise overlappin discs 35 to provide a labyrinthian path 0 sound and air passing out and into the interior of the casing. These mufilers act to deaden and to prevent the escape of any sound and will permit passage of air through the side walls of the casing. A fan 36 is mounted on the shaft 26 and motor 28 in approximate alinement with the mufi1ers 33 and 34 so as to provide ample ventilation through the openings provided by the mufilers. The blades ofthe mufilers are preferably made of a material which does not readily transmit vibration, such as lead, or they may be made with a layer of lead and a layer of strengthening metal for support, as shown in the drawings. In the form of the invention shown in Figs. 3, 4 and 5, the motor is suupported at the side of the main typewriter frame "37 and .is enclosed in a tubular sound deadening housing 38, the walls of which are also preferably madeof three layers similar to those of the housing for the in-' terior portion of the frame of Figs. "1 and 2. The housing is split longitudinally and held together by' bolts 39, as shown in Figs.

ing the sound and preventing its escape lapping of the fan and wall assists the fan from the housing. The wall of the housing is provided with a peripheral groove- 43 in registration with the fan 44 so that the extremity of the fan blades is overlapped by t e housing wall. This overin creating a suction for drawing the air through the housing. As shown in Figs. 4

and 5, a bracket or plate 45 is provided for securing the motor to the frame 37 of the typewriting machine. This bracket is secured to the motor by screws 46 andto the frame of the. machine by screws 47.

To deaden the vibration created by the moving parts and to prevent their trans-- mission from the motor to the frame, an insert 48 of lead or other inert material is interposed between the motor and the plate 45.. The material 48 is compressed by. thescrews 46 so as to provide a cushioning effect between the two parts, but sufiicient contact surface between the bracket 46 and the motor support 49 is provided in addition .to the lead insert 48 to provide a positive stop of rigid metal. A similar lead insert 50 is interposed between the bracket 45 and the frame 37. The screws 46 and 47 maybe provided with longitudinal openings 51 which'are filled with lead or sim1lar;material to prevent transmission of thevlbraa sound deadening wall interposed bet-we chamber.

2. In a typewriter, a motor, ahousing for said motor having sound deadening walls, and mufllers at opposite ends of said housing, said mufl'iers including fixed bafiies ar ranged in staggered offset relation to one another to provide labyrinthine passages from the interior ofsaidhousing.

- 3. A typewriter comprisinga frame having a platen mounted thereon, amotor disposed within said frame beneath said platen,

said motor and platen, a sliding type rier mounted on said frame, toggle mec nism for actuating said type carrie'r,a means driven said motor "for operating said toggle mec anism.

4. A substantially noiseless power driven typewriter comprising a metal frame having a sheet metal chamber therein, walls of sound'deadening material for the inside of said chamber comprising a layer oflead superimposed upon the sheet metal of the. chamber, and a layer of felt superimposed upon. said layer of lead, substantially noiseless printing mechanism disposed outside of said chamber, and actuating mechanism including a motor disposed within said chamber.

In testimony whereof I have signed my name to this specification on this 24th day of November, A. D. 1924.

' CONRAD D. YO'UNGBERG. 

